contradish 0.5.1

CAI testing for LLM apps. Consistency scoring, failure fingerprinting, integration exporters (Langfuse, Phoenix), audit export, regression gating, and prompt repair.

contradish

CAI testing for LLM applications.

A CAI failure is when your app says "refunds within 30 days" to one phrasing and "we can work something out" to a slightly different one. Same policy, same session, opposite answers. Contradish finds these, scores them, and gives you the tools to fix them before users do.

pip install contradish

---

What it does

Offline testing. Run before deploy. Contradish generates adversarial paraphrases of your test inputs, sends them all to your app, and scores consistency across responses.

Regression gating. Compare baseline vs candidate on the same test suite. Block merges if the CAI score drops below your threshold.

Production monitoring. Wrap your live app with the Firewall. It checks each response against recent ones and flags (or blocks) contradictions in real time.

Prompt repair. Failing tests? Contradish generates 3 improved prompt variants, tests each one, and ranks them by CAI score.

Failure fingerprinting. Groups failures by root cause. Tells you it's numeric drift, not just "3 failures."

Integration exporters. Push results into Langfuse or Phoenix. Feeds your stack, doesn't replace it.

Audit export. Timestamped compliance document. NIST AI RMF and EU AI Act aligned. One function call.

---

Quickstart

from contradish import Suite, TestCase

suite = Suite(app=my_llm_function)
suite.add(TestCase(input="Can I get a refund after 45 days?", name="refund policy"))
report = suite.run()

print(report.cai_score)           # 0.0-1.0, higher = more consistent
for r in report.results:
    print(r.test_case.name, r.cai_score)

From a system prompt:

suite = Suite.from_prompt(
    system_prompt="You are a support agent. Refunds within 30 days only.",
    app=my_llm_function,
)
report = suite.run()

CLI:

export ANTHROPIC_API_KEY=sk-ant-...

# test a system prompt directly
contradish "You are a support agent. Refunds within 30 days only."

# test from a file
contradish --prompt system_prompt.txt --app mymodule:my_app_function

# save a shareable HTML report
contradish --policy ecommerce --app mymodule:my_app --report

---

Policy packs (new in v0.4.2)

No system prompt. No test cases. 48 prebuilt cases across 4 domains. Real CAI results in under 2 minutes.

contradish --policy ecommerce --app mymodule:my_support_bot
contradish --policy hr --app mymodule:my_hr_assistant
contradish --policy healthcare --app mymodule:my_benefits_bot
contradish --policy legal --app mymodule:my_legal_tool

# no --app runs in demo mode against the raw LLM
contradish --policy ecommerce

From Python:

from contradish import Suite

suite = Suite.from_policy("ecommerce", app=my_app)
report = suite.run()

Inspect or extend a pack:

from contradish import load_policy, list_policies

print(list_policies())     # ['ecommerce', 'hr', 'healthcare', 'legal']

pack = load_policy("ecommerce")
print(pack.display_name)   # "E-Commerce Support"
print(len(pack))           # 12

suite = Suite(app=my_app)
for tc in pack.cases:
    suite.add(tc)
suite.add(TestCase(name="custom", input="My own test question"))
suite.run()

Pack	Cases	Covers
ecommerce	12	Refunds, returns, price matching, shipping, warranties
hr	12	PTO, benefits, parental leave, termination, overtime
healthcare	12	Coverage, referrals, deductibles, prior auth, eligibility
legal	12	Disclaimers, liability, advice boundaries, data privacy

Each case targets an inconsistency vector where LLM support bots most often contradict themselves.

---

Shareable HTML reports (new in v0.4.3)

Run with --report and get a self-contained HTML file you can paste into a PR, send to your team, or post.

contradish --policy ecommerce --app mymodule:my_app --report
contradish --policy ecommerce --app mymodule:my_app --report ecommerce.html

From Python:

from contradish.reporter import to_html

html = to_html(report)
open("report.html", "w").write(html)

---

CAI score

0 to 1. Higher is more consistent.

• 0.80+ stable. Safe to ship.
• 0.60-0.79 marginal. Review the flagged rules.
• < 0.60 unstable. CAI failures detected.

CAI FAILURE: "refund window"
  input:      "Can I get a refund after 45 days?"
  paraphrase: "I bought this 6 weeks ago, can I still return it?"
  output_a:   "Refunds are only available within 30 days of purchase."
  output_b:   "We can usually make exceptions for recent purchases."
  CAI score:  0.54 (unstable)

1 CAI failure found. 2 rules clean.

---

Regression testing

Compare two versions of your app before merging. CI fails if the CAI score drops.

from contradish import RegressionSuite, TestCase

suite = RegressionSuite(
    test_cases=[
        TestCase(input="Can I get a refund after 45 days?"),
        TestCase(input="Do you price match competitors?"),
    ]
)

result = suite.compare(
    baseline_app=production_app,
    candidate_app=new_app,
    baseline_label="prod-v12",
    candidate_label="pr-456",
)

print(result)
result.fail_if_below(consistency=0.80)  # raises AssertionError in CI if score drops

Load from a YAML file:

suite = RegressionSuite.load("evals.yaml")

# evals.yaml
test_cases:
  - input: "Can I get a refund after 45 days?"
    name: "refund policy"
  - input: "Do you price match competitors?"
    name: "price matching"

CLI:

contradish compare evals.yaml \
  --baseline mymodule:production_app \
  --candidate mymodule:new_app \
  --threshold 0.80

GitHub Actions

Drop this in .github/workflows/cai.yml:

name: CAI regression

on: [pull_request]

jobs:
  cai:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-python@v5
        with:
          python-version: "3.11"
      - run: pip install contradish anthropic
      - name: Run CAI regression
        env:
          ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}
        run: |
          contradish compare evals.yaml \
            --baseline mymodule:baseline_app \
            --candidate mymodule:candidate_app \
            --threshold 0.80

---

Production Firewall

Wrap your live app. Checks each response against recent ones. Flags or blocks contradictions before they reach users.

from contradish import Firewall

# monitor mode: log contradictions, pass all responses through
firewall = Firewall(app=my_llm_app, mode="monitor")

result = firewall.check(user_query)
print(result.response)

if result.contradiction_detected:
    print(f"Contradiction: {result.explanation}")
    print(f"Contradicts: {result.cached_query}")

# block mode: return a safe fallback when a contradiction is detected
firewall = Firewall(
    app=my_llm_app,
    mode="block",
    fallback_response="Let me get a team member to help with that.",
)

result = firewall.check(user_query)
return result.response  # safe regardless of what the app said

print(firewall.summary())
# {
#   "total_queries": 1240,
#   "contradictions_detected": 18,
#   "responses_blocked": 0,
#   "contradiction_rate": 0.015
# }

---

Failure fingerprinting

"3 failures" tells you nothing. Fingerprinting groups them by what's actually broken.

from contradish.fingerprint import fingerprint

clusters = fingerprint(report)
for cluster in clusters:
    print(cluster)

[Policy contradiction]  2 rules
  rules:   refund window, return eligibility
  fix:     State the boundary explicitly. No exception language.

[numeric_drift]  1 rule
  rules:   warranty period
  fix:     Anchor the number directly in the prompt. "12 months, no exceptions."

Pattern types: policy_contradiction, numeric_drift, exception_invention, eligibility_flip, deadline_drift, hedge_inconsistency, legal_boundary_blur, coverage_inconsistency.

cluster.pattern_type    # "numeric_drift"
cluster.frequency       # 3
cluster.affected_rules  # ["warranty period", ...]
cluster.suggested_fix   # "Anchor the number..."
cluster.to_dict()       # JSON-serializable

---

Integration exporters

Feeds your existing stack. Doesn't replace it.

from langfuse import Langfuse
from contradish.exporters import to_langfuse

client = Langfuse()
to_langfuse(report, client, dataset_name="cai-ecommerce")
# {"items_created": 8, "failures_exported": 5, "passing_exported": 3}

from contradish.exporters import to_phoenix

to_phoenix(report, dataset_name="cai-ecommerce")

Each item carries the contradiction pair, CAI score, severity, and suggested fix. Passing results go too, so you have a baseline for next run.

---

Audit export

One function call. Timestamped compliance document you can hand to legal, attach to a PR, or drop in a NIST AI RMF review.

from contradish.audit import to_audit_html

html = to_audit_html(
    report,
    app_version="prod-v12",
    system_prompt="You are a support agent. Refunds within 30 days only.",
    evaluator_id="ci-run-456",
)
with open("cai-audit-2026-03-25.html", "w") as f:
    f.write(html)

Covers NIST AI RMF MAP 1.6, MEASURE 2.5, MANAGE 1.3. EU AI Act Articles 9 and 72. ISO/IEC 42001.

---

Prompt repair

Found failures? Generate improved prompt variants, test each one, get them ranked by CAI score.

import anthropic
from contradish import Suite, PromptRepair

client = anthropic.Anthropic()

def make_app(system_prompt):
    def app(question):
        msg = client.messages.create(
            model="claude-haiku-4-5-20251001",
            max_tokens=256,
            system=system_prompt,
            messages=[{"role": "user", "content": question}],
        )
        return msg.content[0].text.strip()
    return app

# find the failures
suite = Suite.from_prompt(
    system_prompt=original_prompt,
    app=make_app(original_prompt),
)
report = suite.run()

# fix them
repair = PromptRepair(n=3)
results = repair.fix(
    system_prompt=original_prompt,
    report=report,
    app_factory=make_app,
)

best = results[0]
print(f"CAI: {best.original_cai_score:.2f} -> {best.improved_cai_score:.2f} (+{best.delta:.2f})")
print(best.improved_prompt)

  Prompt repair results:
  #1: CAI 0.54 -> 0.88 (+0.34)
  #2: CAI 0.54 -> 0.81 (+0.27)
  #3: CAI 0.54 -> 0.76 (+0.22)

---

JSON output

Any command supports --json:

contradish --prompt system_prompt.txt --json | jq '.cai_score'

{
  "cai_score": 0.71,
  "total": 4,
  "passed": 3,
  "failed": 1,
  "results": [...]
}

---

Test case format

test_cases:
  - input: "Can I get a refund after 45 days?"
    name: "refund window"
  - input: "Do you match competitor prices?"
    name: "price matching"
    expected_traits:
      - "should say no"
      - "should not invent exceptions"

JSON also works:

[
  {"input": "Can I get a refund after 45 days?", "name": "refund window"},
  {"input": "Do you match competitor prices?", "name": "price matching"}
]

---

The CAI benchmark

300-pair human-validated benchmark of adversarial question pairs across support, legal, finance, and policy domains. Used to produce the CAI leaderboard.

Current scores (higher = more consistent):

• Intercom Fin: 0.84
• ChatGPT (GPT-4o): 0.79

---

License

MIT